  Using the Parsons Lee theory we examined the effect of shape anisotropy and
the wall to wall separation on the phase behavior of the hard parallelepiped
rods with dimensions L, D, and D (L>D) in such narrow slitlike pores which only
one homeotropic layer can form. The phase structures, including biaxiality,
planar nematic layering transition as well as planar to homeotropic, were
studied for some separations in the range 2.5D<H<10.0D for H-D<L<H.
