In a wide range of composition Gd-Fe thin films become amorphous. The diffraction patterns of diffuse halo rings are distinguished into three types. The type 1 with a single strong halo appears in the 30-60 percent iron films of any thickness. The type 2 with two strong halos of nearly the same intensity and the type 3 with two halos of different intensities appears in the 60-90 percent iron films thicker and thinner than about 100 A, respectively. Within one type of pattern the peak position of halos shifts with the variation of composition and thickness of the film. The type 2 pattern can be well correlated to the diffraction pattern of the intermetallic compound Fe_3Gd with a rhombohedral structure. The other patterns are difficult to relate with a special type of crystalline phase
