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An analytic expression that includes the effect of multiple reflections within the interface of a spin-valve composed of materials with partial spin polarization was obtained. Inclusion of this term in a micromagnetic calculation demonstrates the effect of the spin polarization of the magnetic material on the current induced behavior of the structure. We show that neglecting to include interfacial scattering events results in an underestimation of the switching current compared to the method detailed in this letter. Multiple reflections also produce a strong dependence of the switching current on the magnetocrystalline anisotropy of the fixed layer.