Comment on a Phys. Rev. Lett. paper: "All-Electron Self-Consistent GW   Approximation: Application to Si, MnO, and NiO". Magnetic moment of NiO
  We claim that any approach neglecting the spin-orbit coupling and the orbital magnetism is not physically adequate for 3d oxides, including NiO, and that in reaching "excellent agreement" in a Phys. Rev. Lett. 93, 126406 (2004) paper too small experimental value of 1.9 muB has been taken for the Ni magnetic moment despite publication of a new experimental value of 2.2 muB, at 300 K yielding 2.6 muB at T = 0 K, already in a year of 1998. 
R. J. Radwanski, Z. Ropka