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Communications ADVANCED MATERIALS[I21 As for (BET-TTF),X (X = SbF,, AsF,, PF,) salts [6] calculations where the outer five membered rings are replaced by two hydrogen atoms and all other geometrical details of the crystal structure are maintained show that most of the HOMO hand dispersion is associated with S,.. . Sj contacts. Consequently, even if it cannot be completely ruled out that the presence of small amounts of the Z isomer (see Scheme 1) can play some role in the observed structural disorder, the conductivity should not he noticeably affected by this fact.