D. Wortmann,¹ H. Ishida,² G. Bihlmayer,¹ and S. Blügel^1
1 "Institute "Theory I"
² College of Humanities and Sciences, Nihon University, Sakura-josui, Tokyo 156, Japan

We present an efficient method for calculating the conductance of ballistic electrons through an interface from first-principles using the embedding approach of Inglesfield. In our method the Landauer-Buttiker formula for ballistic transport is expressed in terms of two quantities that are available in the embedded Green-function formalism without additional calculations. As a proof of principle we calculate on the basis of the density functional theory the spin-resolved electron transmission through a model system of ferromagnetic Co monolayers sandwiched between bulk Cu.