Op t ical studies were .m ade of cr azed surfaces, p r inc ipall y t hose of cast poly meth y l m ethac rylate. The tec hl1lqu es used fo r t hese st udi es we re mult ip le-beam inter fe ro metry a nd li ght a nd electron m icroscop y.
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Newman et al. (1957) studied this question.
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