In this paper we analyze the structure, phase transitions, and some transpo
rt properties of the vortex system when the external magnetic field lies pa
rallel to the planes in layered superconductors. We show that experimental
results for resistivity are qualitatively consistent with numerical simulat
ions that describe the melting of a commensurate rotated lattice. However,
for Some magnetic fields, the structure factor indicates the occurrence of
smectic peaks at an intermediate temperature regime.