  We analyze the experimentally obtained spin-current-related magnetoresistance
in epitaxial Pt/Co bilayers by using a drift-diffusion model that incorporates
both bulk spin Hall effect and interfacial Rashba-Edelstein effect (REE). The
magnetoresistance analysis yields, for the Pt/Co interface, a
temperature-independent Rashba parameter in the order of 1e-11 eV m that agrees
with theoretical calculations, along with an effective interfacial REE
thickness of several angstroms which is in overall consistency with our
previous spin-orbit torque analysis. In particular, our results suggest that
both bulk and interface charge-spin current inter-conversions need to be taken
into account for the spin-current-related magnetoresistance analysis in
highly-conductive magnetic hetero-structures such as the epitaxial Pt/Co
bilayers.
