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Armenian Journal of Physics=Ֆիզիկայի հայկական հանդես
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The problem of the connection of the group delay time (GDT) with the depth in the medium at which the formation of specular reflection of X-rays and neutrons from a semi-infinite homogeneous medium with an ideally sharp interface in the regions up to the threshold of the total external reflection (TER) and above this threshold is discussed. The article has a discussion character and is based on materials that are not included in the review [1].