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High-resolution x-ray scattering measurements on a liquid-crystalline smectic-A₁ phase show two collinear diffuse maxima at incommensurate wave vectors in addition to a fundamental quasi-Bragg peak. These diffuse peaks are shown to agree qualitatively with calculated profiles; they indicate the close proximity of an incommensurate phase with two strongly coupled order parameters.
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Fontes et al. (1988) studied this question.
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