Formulae are derived for the calculation of the polar-coordinates and indices of the Laue spots on the film for the perfect crystal lattice. This calculated Laue pattern can be used as a reference pattern for any deviation of the experimental one. The formulae are given for the cases where the incident beam is perpendicular to (001), (010), (100) or (111). An example of the evaluation of a group of Laue spots of the Laue pattern of a muscovite mica will be given and discussed.

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