The influence of resorting potential parity on anisotropic diffusion models describing molecular reorientational in biomembranes had led to a comparison of the decay rates from existing first-order, single exponential approximations, to the short-time limit decay rates obtained from the numerically evaluated multi-exponential correlation functions. For high molecular order, <D(2)00(Ω)> ≥0.6, the decay rates from single exponential approximations characterize the multi-exponential correlation functions well. At reduced molecular ordering <D(2)00(Ω)> < 0.6, analytical expressions for second-order, single exponential decay rates for the [1,1], [1,-1], [1,0] and [0,0] reorientational modes were presented.

Anisotropic Diffusion in Oriented Systems Improved Approximations for Molecular Dynamics. Alam, T.M.: Chemical Physics Letters, 1994, 222[5], 493-502