Transport anomaly at the ordering transition for adatoms on graphene
  We analyze a manifestation of the partial ordering transition of adatoms on graphene in resistivity measurements. We find that Kekule mosaic ordering of adatoms increases sheet resistance of graphene, due to a gap opening in its spectrum, and that critical fluctuations of the order parameter lead to a non-monotonic temperature dependence of resistivity, with a cusp-like minimum at T=T_c. 
Sergey Kopylov, Vadim Cheianov, Boris L. Altshuler, Vladimir I. Fal'ko
cond-mat.dis-nn cond-mat.stat-mech