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Dear all

In one of my unpublished paper, I used second order perturbation theory to calculate the magnetic anisotropy of a Ni surface. The unperturbated wavefunction was calculated by colinear DFT. The detail formula can be found in Phys. Rev. Lett. 99, 177207.I think as long as the perturbation converged, the Rashba and Dresselhaus term has been included in the calculation. Because the information of symmetry breaking is contained in the charge density (or orbital occupancy) of colinear DFT. However, somebody told me that I should additionally include a Rashba term to make my calculation suitable for a surface system. So I am confused. Who is correct?