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The question of whether layer decoupling and vortex-lattice melting occurseperately or not in the mixed phase of pristine layered superconductors in theextreme type-II limit is studied through a partial duality analysis of thelayered XY model with uniform frustration. We find that both transitions occursimultaneously if the normal/superconducting transition of the vortex latticein an isolated layer is first-order and if a sufficient degree of layeranisotropy exists. We also find that a cross-over to a highly entangled vortexlattice phase with relatively low phase rigidity across layers does not occurin practice under any circumstances at temperatures below the two-dimensionalvortex-lattice melting transition.Comment: 15 pgs. of plain TeX, 2 figs, erratum appende

Sublimated decoupling of the vortex lattice in extreme type-II layered superconductors