andreyin: That's the exact expression that I posted in this very thread :P
You might notice that the expression doesn't do exactly what the OP requested, but since there's still some confusion about this, here's the expression that you use to get aiming with the right analogue stick: angle(0,0,Gamepad.Axis(0,2),Gamepad.Axis(0,3)).
Note the axes specified there - those refer to the right stick, whereas 0 and 1 (as in my first post in this thread) refer to the left stick.
The example capx that I posted in the other thread earlier.