If set to yes, Octopus will use for U and J a formula which is rotationally invariant. This is different from the original formula for U and J. This is activated by default, except in the case of spinors, as this is not yet implemented in this case.
hamiltonian/lda_u.F90 : 309
call parse_variable(namespace, 'ACBN0RotationallyInvariant', st%d%ispin /= SPINORS, this%rot_inv)