  In this paper, we argue that, in 2-d, the weak localisation of bosons, which
occurs on the insulating side of the superconductor-insulator transition, is
characterised by $\rho \sim ln(1/T)$, as compared to $\sigma \sim lnT$ for
fermions. Such an unconventional behaviour is tied to the diffusion pole of the
delocalised (uncondensed) vortices.
