  We consider a two-dimensional electron gas in an inversion asymmetric layer
and in the presence of spatially distributed magnetic impurities. We
investigate the relationship between the geometrical properties of the
wave-function and the system's spin dependent transport properties. A
localization transition, arising when disorder is increased, is exhibited by
the appearance of a fractal state with finite inverse participation ratio.
Below the transition, interference effects modify the carrier's diffusion, as
revealed by the dependence on the scattering time of the power law exponents
characterizing the spreading of a wave packet. Above the transition, in the
strong disorder regime, we find that the states are spin polarized and
localized around the impurities. A significant enhancement of the spin current
develops in this regime.
