Magnetic anisotropy in spin-3/2 with heavy ligand in honeycomb Mott insulators: Application to <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>CrI</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>
Physical review research