Fig. 1: Top: calculated low-energy electronic band structure of graphite at K along the lines towards Γ and M points.
From: Ultralong 100 ns spin relaxation time in graphite at room temperature

Note the band degeneracy near the K point. Middle and bottom: spin-mixing parameters \({b}_{k}^{2}\) for the spin quantization (magnetic field B) along c and in the plane (a, b), respectively. Also indicated are the spin relaxation anisotropies for the momenta at the vertical dashed lines, implied by the calculated \({b}_{k}^{2}\) there.