The interferograms of two-layer and three-layer interferometers were recorded by a photoelectric method. The fringes corresponding to each layer appear in the same form and in the same position as they would for the separate layer. The fringes of the constituent layers modulate each other in such a manner that the maxima of each layer are intensified when they coincide with maxima of other layers, but suppressed when they coincide with minima of other layers.