  Results of numerical simulation of the weak localization in two-dimensional
systems in wide range of magnetic filed are presented. Three cases are
analyzed: (i) the isotropic scattering and randomly distributed scatterers;
(ii) the anisotropic scattering and randomly distributed scatterers; (iii) the
isotropic scattering and the correlated distribution of the scatterers. It is
shown that the behavior of the conductivity beyond the diffusion regime
strongly depends on the scattering anisotropy and correlation in the scatterer
distribution.
