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The general theory of the irreducible representations of a space group with two atoms per unit cell is discussed. A particular application of it is made for the group of k = 0 for the close-packed hexagonal lattice. This leads to the determination of the spherical harmonics with the symmetry of this group. A technique is described to determine the boundary and continuity conditions on the surface of the Wigner-Seitz polyhedron. It is pointed out that these vary for different types of points on this surface and complete tables for them are given.
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S. L. Altmann (1958) studied this question.
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