Crystal J33
An example of a doubly filled sandwich cofiguration as classified using non-degenerate polytype sandwich scheme.
(a) Part of a full plate edge topograph of a complex array of thick basic poytypes and thinner 1DD/LPP layers forming a doubly filled sandwich that can now be confidently resolved routinely and adding to the database on polytype neighbourism. The double filling is a 70 m m 1DD layer next to a LPP assigned 78H/234R, previously reported by Mitchell (1954).
(b) The central 4150 reflection giving a full crystal thickness of 2550 m m and showing defect density bands at all the polytype-polytype and polytype-disorder boundaries.
(c) A model to scale of the polytypic content of sample J33.
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