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The results are given for the calculation of the profile function of the scattering curve and the calculated primary extinction factor for a crystal in the form of a square-section parallelepiped as a function of its size τ, expressed in extinction length units. The calculations are based on the equations of the dynamical theory of diffraction. Asymmetry of the scattering curve and a shift of its principal maximum to larger angles, with τ and the Bragg angle increasing, are found. Approximate expressions for calculating the primary extinction factor as a function of τ are given.
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