  Li2RuO3 undergoes a structural transition at a relatively high temperature of
550 K with a distinct dimerization of Ru-Ru bonds on the otherwise isotropic
honeycomb lattice. It exhibits a unique herringbone dimerization pattern with a
largest ever reported value of the bond shrinkage of about ~ 0.5 \r{A}. Despite
extensive studies, both theoretical and experimental, however, its origin and
its effect on physical properties still remain to be understood. In this work,
using high quality single crystals we investigated the anisotropy of
resistivity ($\rho$) and magnetic susceptibility ($\chi$) to find a very clear
anisotropy: $\rho$$_c*$ > $\rho$$_b$ > $\rho$$_a$ and $\chi$$_b$ > $\chi$$_a$ >
$\chi$$_c*$. For possible theoretical interpretations, we carried out density
functional calculations to conclude that these anisotropic behavior is due to
the correlation effects combined with the unique orbital structure and the
dimerization of Ru 4d bands.
