  The Dyakonov-Perel (DP) mechanism of spin relaxation has long been considered
irrelevant in centrosymmetric systems since it was developed originally for
non-centrosymmetric ones. We investigate whether this conventional
understanding extends to the realm of orbital relaxation, which has recently
attracted significant attention. Surprisingly, we find that orbital relaxation
in centrosymmetric systems exhibits the DP-like behavior in the weak scattering
regime. Moreover, the DP-like orbital relaxation can make the spin relaxation
in centrosymmetric systems DP-like through the spin-orbit coupling. We also
find that the DP-like orbital and spin relaxations are anisotropic even in
materials with high crystal symmetry (such as face-centered cubic structure)
and may depend on the orbital and spin nature of electron wavefunctions.
