Special features of the multilayer Pd/Fe films structure determined from X-ray data

X-Ray studies of thin multilayer Pd/Fe films were performed for samples with a fixed thickness of Fe layers ($\sim$6 Å) and a variable thickness of Pd layers (6-40 Å), samples with a fixed thickness of Pd layers ($\sim$30 Å) and a variable thickness of Fe layers (6-27 Å), and a sample with Pd and Fe layers equally thick ($\sim$9 Å). Films with Fe and Pd layers about 6 Å thick were shown to be structurally homogeneous. An increase in the Pd layer thickness caused the appearance of a structure modulated (quasi-sinusoidal) with respect to the concentrations of the components. If the thickness of Fe layers was 9 Å or more, a modulated FCC-Fe phase separated. In the presence of Pd layers 30 Å thick, a multilayer structure with the thickness of Fe layers reached 23 Å formed.