radish: just btw, [ ] notation is meant to be read as "press and hold this input". (so, [8] means "press up and hold it".)
for the basic 2K-c.S-2D xx tatami combo, in addition to what Hellmonkey said, you can do the following:
vs Robot, Pot
... 2D -> j.S-D
vs Baiken
... j.K -> dj.K xx YZS
The thing about the Robot and Pot version is that, you can't do it ASAP, because the 2D will whiff. It's not that hard, though, but just keep that in mind, if you try it and see that they tech.
For the Baiken one, the range it works at is like the range the sj.P follow-up works for most other characters. The j.K looks like it shouldn't hit, but Baiken's sandals kinda extend her lower air hitbox, and allow you to kick her for extra damage.
oh and for the sake of trivia:
vs Kliff
... sj.P-D
If you try sj.P-S, the S will whiff.
vs Justice
NOTHING
wtf