This paper presents the results of calculations and optically determined experimental values of the initial director tilt, the layer thickness, and the phase lag for cells with a nematic liquid-crystal (LC). Layers of germanium monoxide (GeO), amorphous hydrogenated carbon (a-C:H), and a combination of them were used in the LC cells to vary the director tilt. Known methods for determining the director tilt are compared with a method proposed by the authors. The proposed method has an advantage in the case of oblique orientation of the slope angle of the LC for angles greater than 15° and is of interest for studying LC devices of adaptive optics, since, along with the main parameter—the maximum phase increment—it makes it possible to estimate the director tilt.

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