Using the known relations M o = e 2 m J o , and M s = g ⋅ ⋅ e 2 m J s , where g ≈ ≈ 2.002 is the g-factor for the anomalous magnetic moment of the electron, one can derive the relative spin contribution to magnetization as: M s M = ( g ′ − − 1 ) g ( g − − 1 ) g ′ .