This is kind of a stupid question, but how do I know what is the spin degeneracy of my system?
This is determined by spin.type (https://docs.nanoacademic.com/rescu/input_reference/spin_input/?highlight=spin%20type). If spin.type = 'collinear' there are two spin indices, and only one otherwise. But if spin.type = 'non-collinear', certain quantities like density have 4 components (i.e. [N,mx,my,mz]).
spin.type
spin.type = 'collinear'
spin.type = 'non-collinear'
Got it! Thank you very much!
