We report a synchrotron x-ray scattering study of linear DNA chains and cationic liposome mixtures which spontaneously self-assemble into a coupled two-dimensional (2D) smectic phase of DNA chains imbedded between lipid bilayers of a 3D smectic phase. The DNA peak is quantitatively described by anisotropic exponentially decaying chain-chain correlations. The measured interchain compressibility modulus $B(d)$ as a function of the interhelical spacing d of the 2D smectic, with 25 35 by long-range electrostatic repulsions.
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Salditt et al. (1997) studied this question.
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