  We have studied the resistance of two-dimensional random percolating networks
of zero-width metallic nanowires (rings or sticks). We toke into account the
nanowire resistance per unit length, the junction (nanowire/nanowire contact)
resistance, and the busbar/nanowire contact resistance. Using a mean-field
approximation (MFA), we derived the total resistance of the nanoring-based
networks as a function of their geometrical and physical parameters. We have
proposed a way of accounting for the contribution of the busbar/nanowire
contact resistance toward the network resistance. The MFA predictions have been
confirmed by our Monte Carlo (MC) numerical simulations. Our study evidenced
that the busbar/nanowire contact resistance has a significant effect on the
electrical conductivity when the junction resistance dominates over wire
resistance.
