An estimation of dimensional crossover temperature in presence of two different Josephson couplings in high Tc superconductors

In layered high Tc superconductors the fluctuation effects play a major role in dimensional crossover. In the crystal structure of copper oxide superconductors, there are N superconducting CuO2 layers per elementary unit cell with (N-1) equal spacings d and one different spacing d and along c axis, s is the repeat distance with s = d + (N - 1)d. The layers are coupled by Josephson coupling strengths J1 and J2 respectively