“…4,[6][7][8]10 As a consequence of the quantization of the electronic structure, many properties of metal films show a quantum size effect, [3][4][5][6]14,15 i.e., a (oscillatory) dependence on the film thickness D, where D can be changed only by the discrete amount given by the interlayer spacing a. Because of the fundamental and practical interest quantum size effects have been studied in detail for the work function and surface energy, [16][17][18][19][20] chemical reactivity, 21 magnetic coupling, 5,[22][23][24] Rashba effect, 25,26 etc.…”