A simple expression for the interface resistance between two materials has
been derived by Schep et al. [J. Magn. Magn. Mater. 177, 1166 (1998)] in te
rms of the transmission probability for electrons at the interface. This ap
proximation is tested for a simple model interface and good agreement is fo
und with solutions of the Boltzmann equation. Previously calculated values
of the transmission probability rue used with this simple expression to eva
luate the spin-dependent interface resistances of a number of ferromagnetic
-normal metal interfaces. The agreement between the calculated results and
the results extracted from experiments on Cu/Co argue that the interface re
sistance may not be dominated by defect scattering as is often assumed.