Amplitude Ratios and the Approach to Bulk Criticality in Parallel Plate   Geometries
  We present analytical and numerical results for the specific heat and susceptibility amplitude ratios in parallel plate geometries. The results are derived using field-theoretic techniques suitable to describe the system in the bulk limit. Advantages and drawbacks of our method are discussed on the light of other approaches previously reported in the literature. 
M. M. Leite, M. Sardelich and M. D. Coutinho-Filho