[Wien] Which notation for the spin direction in hexagonal structure

[Abderrahmane Reggad]

Dear Wien2k users

I want to introduce the spin-orbit coupling in my calculation for a
hexagonal structure.

Would you inform me which notation should we use to introduce the spin
direction : that of 3 indicesor that of 4 indices.

NB: The spin direction for my case is the z direction

Best regards

-- 
Mr: A.Reggad
Laboratoire de Génie Physique
Université Ibn Khaldoun - Tiaret
Algerie
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