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SYMMETRY PROBLEMS OF LAYER TWINNING STRUCTURES
NING OF ALL SEVEN RHOMBOHEDRAL SPACE GROUPS
2-fold screw a-AlB a(xyz Acta Cryst alternating stacking Appendix atoms basis vectors body-centered boron boron carbide Bravais lattices center of inversion composite cell composite lattice composite space group compounds coordinate system Crystal structure crystallographic cubic denote derived diagram E|rc E|rcf E|rh E|rob E|roe E|rt E|rtb Example Figure Framework structure group symmetry hemi-icosahedron Hexagonal close packing hexagonal nets holohedry HTL-Pbca hydrobromide icosahedra indices kagome lattice constants lattice geometry lattice parameters lattice points lattice transformation lattice translations layer of structure layer stacking structures layer twinning structures methionine monoclinic monotonous stacking norleucine notation obtain origin orthorhombic P3ml parallel Pbca phthalocyanine point group point group symmetry polytypic position vector rhombohedral screw axis sectional plane group shown in Fig similarity transformation space group analysis stacking vectors Subroutine symmetry elements symmetry operator Table tetragonal transformation matrix twin element twin mode twin operator twin plane two-fold screw unit cell vector triplet y-AlB