Excimer laser treated polymer foils have been investigated with respec
t of their surface morphological changes. Laser fluences below the abl
ation threshold caused regular (in large scale) and irregular (in smal
l scale) patterns on the surface of irradiated foils. The observed pec
uliarities in surface morphology have been characterized within the fr
amework of fractals. The fractal (box-counting) dimension of irradiate
d areas in the range of applied fluences has been determined.