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Molecular imaging of metal-free phthalocyanine, prepared expitaxically on KCI, showed two polymorphs. The unit-cell constants, measured from the ac projection, differed from previously quoted values and this was attributed to the effect of the preparation substrate. The transformation of one phase into another was apparently martensitic with lamellae of the opposite phase being present in both polymorphs.
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J. R. Fryer (1979) studied this question.
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