Simultaneous magnetic-deformation and light-scattering studies of the nematic bend and twist constant exponents respectively suggest that the nematic-smectic-A critical point is weakly anisotropic, in disagreement with all theories of the nematic-smectic-A transition. This study also suggests that the bend exponent is universal and very close to the helium value.
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Gooden et al. (1985) studied this question.
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