Angle orientation

[michelgaglioni]

Hi everyone,

Does anyone now precisely what's the orientation of the angles in S4? The information in the documentation is somehow incomplete, and since I'm working on assymetric structures I need to make sure about that. Where does the polar and azimutal angles start and end? What does it mean, for instance, 90 < phi < 180 considering the azimutal angle equals to zero? Does the incident vector lie in the positive or negative x coordinate? and what about the plane? It would be very helpful if someone could draw a scheme of that.

Thanks!