Nevermind, I found the solution. The command is feSurfaceOffsetTangent, as described in the API on page 413.
The caption on that page is incorrect, that's why I couln't find it (see attached). Can/should I report this to anyone?
when you fix the Femap Help, could you fix an another issue too?
On the search screen in column "Place" is in all row "FEMAP 11.2.2 Help" instead of categories as "What's New in FEMAP", "Commands", "User Guide", "Examples" or "API", etc.:
It is annoying, when I search for an API command in Femap Help, I must read all row to find a command. In earlier version of Femap this was correct, in column "Place" was the category.