The thickness-dependent spin-polarized electronic structure of straine
d ultrathin and thin films of Gd has been investigated. The surface ma
gnetic structure dominates the magnetic ordering of the ultrathin Gd f
ilms. With decreasing thickness some bulk bands exhibit increasingly m
ore ''passive'' magnetic behavior. These bulk bands resemble a paramag
net over an increasing volume of the bulk Brillouin zone with decreasi
ng film thickness.