  We study theoretically formation of two-dimensional (2D) charge density wave
(CDW) in a system of conducting chains at the surface of an insulator due to
interaction of quasi 1D surface electrons with phonons. We show that the
unscreened long-range Coloumb interaction between the charges induced by
fluctuations of the CDW phase stabilizes the finite order parameter value at
finite temperatures, and thus the long-range order (LRO) exists. In the case of
screened Coloumb interaction the phase fluctuations suppress the phase
transition, but decay of the order parameter is rather slow, it obeys a
power-law $<\Delta^*(r) \Delta(0)> \propto r^{-\gamma}$ with small exponent
$\gamma$
