  We find that the hole mobility of the crystal smectic phases of the liquid
crystal 1,4-di-(5-n-tridecylthien-2-yl)-benzene increases exponentially with
decreasing temperature. While qualitatively consistent with transport via
polaron bands, we find that it is quantitatively difficult to explain the
behaviour with physically realistic parameters. In particular, the data demand
either quite large typical optical phonon frequencies and/or phonon bandwidths.
We also find evidence that an unusually highly ordered smectic-F phase
templates the formation of lower temperature highly crystalline smectic phases,
which may have implications for device development.
