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| Introduction |
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| Adjacent
to the Td hole, three atoms in the B layer touch three atoms
in the A layer such that a trigonal antiprismatic polyhedron (a regular
octahedron) is formed. At the center of the octahedron is a cavity
called the Octahedral Hole (a common symbol for "octahedral" is
Oh). A guest sphere will just fill this cavity and touch the
six host spheres if its radius is approximately 0.41r. It can be
shown that there are twice as many Td holes as there
are Oh holes in any closest packed bilayer.
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