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Marked pretransition softening is reported of the smectic layer elasticity near the weakly first-order smectic-A-nematic phase transition in N-p-cyanobenzilidene-p-n-octyloxyaniline (CBOOA). In addition, it is demonstrated that CBOOA will not support a static layer strain. This new relaxation process is studied in detail.
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Noel A. Clark (1976) studied this question.
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