Magnetic phase transitions in ultrathin films of different crystal   structures
  The properties of ultrathin films have been studied within the framework of Ising model and the method of random-field interactions. It is shown that the Curie temperature is inversely proportional to the number of layers. Critical exponent $\nu$ has been obtained and it is shown that it does not depend on the type of crystalline lattice. 
Yury Kirienko and Leonid Afremov
cond-mat.mes-hall cond-mat.mtrl-sci