  Ferromagnetic-paramagnetic phase transitions in classical and quantum thin
films have been studied up to 50 mono-layers using effective field theory with
two-site cluster approximation. Variation of the Curie temperature as a
function of film thickness has been examined. The relative shift of the Curie
temperature from the corresponding bulk value has been investigated in terms of
the shift exponent $\lambda$. We have found that shift exponent $\lambda$
clearly depends on the strength of the ferromagnetic exchange coupling of the
surface. Moreover, we have not observed any significant difference between
classical and quantum exponents for a particular model.
