States with the highest M J = ±9/2 angular momentum projection lie lowest in energy. This indicates easy-axis magnetic anisotropy with magnetization preferentially oriented perpendicular to the surface, which is consistent with experimental observations. The first excited doubly-degenerate state, M J = ±7/2, corresponds to a 70 • rotation of the magnetic moment from the surface plane. Non-collinear DFT calculations for this deflection angle did not converge. Furthermore, the values of E MAE and U differ due to a sign convention.