  A phenomenological lattice model of high $T_c$ cuprates including order
parameter phase fluctuations is considered within the BCS approximation, to
interpret the experimental data from ARPES measurements on Bi2212 samples. A
Kosterlitz-Thouless (KT) transition temperature $T_c^{KT}$ is estimated below
the mean field transition $T_c^{MF}$, phase boundaries between competing order
parameters of different symmetries are obtained and best model parameters,
fitting the ARPES gap of $d_{x^2-y^2}$ symmetry, are determined. Variation of
$T_c^{KT}$, as a function of the dopant concentration $\delta$, is in
qualitative agreement with experiments.
