8 44 R. Matsumoto and S. Yuasa, private communication. 43 Since k$_{⊥}$ is commonly defined in units of π / a and a cor- responds to an interlayer distance of 2 ML, a factor of π / 2 has to be incorporated to obtain it in units of 1 / ML . 42 P. Bose, P. Zahn, J. Henk, and I. Mertig, Novel Materials and Devices for Spintronics 1183 , FF07 (2009). 41 W. H. Butler, Science and Technology of Advanced Mate- rials 9 , 014106 (2008). 40 C. Heiliger, P. Zahn, and I. Mertig, Materials Today 9 , 46 (2006). 39 Y.-C. Chang, Physical Review B 25 , 605 (1982). 38 V. Heine, Physical Review 138 , A1689 (1965). 37 E. Fawcett, Review of Modern Physics 60 , 209 (1988). 36 P. Bose, I. Mertig, and J. Henk, Physical Review B 75 , 100402 (2007). 35 R. A. Evarestov and V. P. Smirnov, physica status solidi (b) 119 , 9 (1983). 34 J. Henk, A. Ernst, K. K. Saha, and P. Bruno, Journal of Physics: Condensed Matter 18 , 2601 (2006). 25 X.-G. Zhang and W. H. Butler, Physical Review B 70 (2004). 26 R. Zeller, P. H. Dederichs, B. ` Ujfalussy, L. Szunyogh, and P. Weinberger, Physical Review B 52 , 8807 (1995). 27 N. Papanikolaou, R. Zeller, and P. H. Dederichs, J. Phys.: Condens. Matter 14 , 2799 (2002). 28 W. Kohn and L. J. Sham, Physical Review 140 , A1133 (1965). 29 S. H. Vosko, L. Wilk, and M. Nusair, Canadian Journal of Physics 59 , 1200 (1980). 30 H. L. Meyerheim, R. Popescu, N. Jedrecy, M. Ved- pathak, M. Sauvage-Simkin, R. Pinchaux, B. Heinrich, and J. Kirschner, Physical Review B 65 , 144433 (2002). 31 C. Tusche, H. L. Meyerheim, N. Jedrecy, G. Renaud, A. Ernst, J. Henk, P. Bruno, and J. Kirschner, Physical Review Letters 95 , 176101 (2005). 32 C. Heiliger, P. Zahn, B. Y. Yavorsky, and I. Mertig, Phys- ical Review B 72 , 180406 (2005). 33 Y. Imry and R. Landauer, Reviews of Modern Physics 71 , S306 (1999).