Fluctuations of quasi-two-dimensional smectics intercalated between membranes in multilamellar phases of DNA cationic lipid complexes

We theoretically elucidate lamellar phases of DNA-cationic lipid complexes as the very first realization of a decoupled phase of strongly fluctuating 2D smectic DNA manifolds weakly interacting across membranes. Because of couplings between adjacent 2D smectic L-x X L-y planes, recently observed ordinary 2D smectic behavior of DNA in-plane undulations, with [u(2)] similar to L-y(1/2) similar to L-x, must cross over, at long scales, to a novel fluctuation behavior, with [u(2)] similar to (lnL(y))(2) similar to (lnL(x))(2).