Some new findings concerning the structural, optical, transport and magnetotransport properties Of tau-(EDO-S,S-DMEDT-TTF)(2)(AuBr2)(1+y) and tau-(P-S S-DMEDT-TTF)(2)(AuBr2)(1+y) (Y approximate to 0.75) are reported. Some similarities and dissimilarities in the properties are discussed. The dissimilarities are more pronounced at low temperatures and high magnetic fields. The results are compared to those obtained of other conducting multilayered systems.