  The temperature, doping and field dependences of the magnetoresistance (MR)
in Pr_(2-x)Ce_(x)CuO_(4-delta) films are reported. We distinguish between
orbital MR, found when the magnetic field is applied perpendicular to the ab
planes, and the nearly isotropic spin MR. The latter, the major MR effect in
the superconducting samples, appears in the region of the doping-temperature
phase diagram where d(rho)/dT<0, or an upturn in the resistivity appears. We
conclude that the upturn originates from spin scattering processes.
