Аннотация:The polarized reflectance and optical conductivity spectra of layered organic conductorsD4[MBr4](Solvent): θ-(BEDT-TTF)4HgBr4(DCB), θ-(BEDT-TTF)4CdBr4(DBB), θ-(d8-BEDTTTF)4CdBr4(DBB), and θ-(BETS)4CdBr4(PhBr) (DCB and DBB = o-dichloro and o-dibromo-benzenes, BEDT-TTF and BETS are bis(ethylenedithio)tetrathia- and bis(ethylenedithio)tetraselena-fulvalene) arestudied. The adjacent conducting layers of these compounds differ in the direction of their stacks of radical cations (the directions of the stacks are mutually perpendicular). It is shown that these conductors are characterized by high isotropy of the electronic system in the conducting plane and the quasi-two-dimensional nature of the electronic conductivity, which is in good agreement with the crystal structure.