  We study the dependence of perpendicular-current magnetoresistance in
magnetic multilayers on the angle between the magnetizations of the layers.
This dependence varies with the thickness of one of the layers, and is
different for multilayers with two and three magnetic layers. We derive a
system of equations representing an extension of the two-current series
resistor model, and show that the angular dependence of magnetoresistance gives
information about the noncollinear spin-transport in ferromagnets.
