We present new chemical, crystallographic and electrical conductivity data concerning the title compounds. It is found that the c axis repeat distances of the bi-intercalation compounds (GBC) are almost identical to the sum of the interplanar distances of the associated binary compounds. The basal plane resistivity ρ a decreases upon intercalation of the second halide into the stage two, binary host: ρ a ∼ 5 ± 1 μΩ cm at 295 K and ρ 295 ρ 4.2 < 10 for the GaCl 3− and AlCl 3-containing GBC. The c axis resistivity possesses a positive temperature coefficient for all compounds examined except the 4th stage FeCl 3 GIC. The room temperature anisotropy is ∼10 6 for 1st and 4th stage GaCl 3 GIC as for low stage AsF 5 materials. Chemically determined values of the charge transfer are about twice as great as those evaluated from analysis of the C-C bond distances.