Using a generalized Landauer-type formula in terms of real.spin-space Green functions, we analyze spin-polarized transport in two-dimensional fully quantumcoherent systems by computing components of their exact two-probe zero-temperature conductance matrix, as well as their mesoscopic fluctuations. We find that the interplay of strong Rashba spin-orbit coupling and phase-coherent propagation through disordered mesoscopic spintronic devices leads to a dramatic reduction of localization effects on the conductances and their variances. The transport properties also depend on the chosen axis of spin-polarization.
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