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lattice hcp alength
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Style hcp has a1 = 1 0 0, a2 = 0 sqrt(3) 0, and a3 = 0 0 sqrt(8/3)¡­A hcp lattice has 4 basis atoms, two in the z = 0 plane and 2 in the z = 0.5 plane.
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description of HCP
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