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Taking into account the scattering from bulk impurities and rough interfaces,we use the quantum-statistical Greens function approach and Kubo theory to calculate the one-particle Greens function and the conductivity in a magnetic multilayered metallic system.It is found that the conductivity depends on both the spatial size and the amplitudes for the reflected waves by the interfaces,and exbibits the main features of the giant magnetoresistance experiment.
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