[ALICE3] Update IOTOF README.md (#15146)

Author: njacazio

Detectors/Upgrades/ALICE3/IOTOF/README.md

@@ -14,16 +14,16 @@ Configurables for various sub-detectors are presented in the following Table:
 
 [link to definitions](./base/include/IOTOFBase/IOTOFBaseParam.h)
 
-| Options                       | Choices                                                          | Comments                                    |
-| ----------------------------- | ---------------------------------------------------------------- | ------------------------------------------- |
-| `IOTOFBase.enableInnerTOF`    | `true` (default), `false`                                        | Enable inner TOF barrel layer               |
-| `IOTOFBase.enableOuterTOF`    | `true` (default), `false`                                        | Enable outer TOF barrel layer               |
-| `IOTOFBase.enableForwardTOF`  | `true` (default), `false`                                        | Enable forward TOF endcap                   |
-| `IOTOFBase.enableBackwardTOF` | `true` (default), `false`                                        | Enable backward TOF endcap                  |
-| `IOTOFBase.segmentedInnerTOF` | `false` (default), `true`                                        | Use segmented geometry for inner TOF        |
-| `IOTOFBase.segmentedOuterTOF` | `false` (default), `true`                                        | Use segmented geometry for outer TOF        |
-| `IOTOFBase.detectorPattern`   | ` ` (default), `v3b`, `v3b1a`, `v3b1b`, `v3b2a`, `v3b2b`, `v3b3` | Optional layout pattern                     |
-| ----------------------------- | -------------------------                                        | ------------------------------------------- |
+| Options                       | Choices                                                          | Comments                                       |
+| ----------------------------- | ---------------------------------------------------------------- | ---------------------------------------------- |
+| `IOTOFBase.enableInnerTOF`    | `true` (default), `false`                                        | Enable inner TOF barrel layer                  |
+| `IOTOFBase.enableOuterTOF`    | `true` (default), `false`                                        | Enable outer TOF barrel layer                  |
+| `IOTOFBase.enableForwardTOF`  | `true` (default), `false`                                        | Enable forward TOF endcap                      |
+| `IOTOFBase.enableBackwardTOF` | `true` (default), `false`                                        | Enable backward TOF endcap                     |
+| `IOTOFBase.segmentedInnerTOF` | `false` (default), `true`                                        | Use segmented geometry for inner TOF           |
+| `IOTOFBase.segmentedOuterTOF` | `false` (default), `true`                                        | Use segmented geometry for outer TOF           |
+| `IOTOFBase.detectorPattern`   | ` ` (default), `v3b`, `v3b1a`, `v3b1b`, `v3b2a`, `v3b2b`, `v3b3` | Optional layout pattern                        |
+| `IOTOFBase.x2x0`              | `0.02` (default)                                                 | Chip thickness in fractions of the rad. lenght |
 
 
 For example, a geometry with fully cylindrical tracker barrel (for all layers in VD, ML and OT) can be obtained by