Dibenzylthio-dihexadecylthio-tetrathiafulvalene is a new material for constructing a conducting Langmuir-Blodgett (LB) film. A 1:1 molar mixture with arachidic acid forms a conducting LB film of Y-type. The conductivities of this mixed LB film were calculated from experimental results before and after iodine oxidation. The highest conductivity was obtained after iodine doping and reached 0.23 S cm(-1). UV spectral analysis suggests that the system interacts with iodine and gives rise to a new conducting phase after iodine doping of the LB film. Results from X-ray diffraction demonstrate that the as-deposited film has an ordered lamellar structure with a thickness per layer of 2.63 nm.