In Gd/Fe multilayers, the crystallographic structure and the magnetic
properties have been examined for various layer thicknesses, d(Fe) and
d(Gd). The structure changes from crystalline to amorphous below 20,k
of d(Fe) or d(Gd). In the amorphous region, the thickness dependence
of the Curie temperature and the magnetization is explained consistent
ly by the mean field theory.