In this study, the conjugate heat transfer problem of two forced-convection boundary layers of counter-laminar flow on plate sides is analyzed by employing the integral method. The analysis is conducted in a dimensionless way to generalize the solution. The dimensionless parameters governing the thermal coupling between the two convection layers are revealed from the analysis. These parameters give a measure of the relative importance of interactive heat transfer modes. Mean Nusselt number results are obtained for a wide range of the governing parameters. C⃝ 2016 Wiley Periodicals, Inc. Heat Trans Asian Res, 46 (7): 878-894, 2017; Published online in Wiley Online Library (wileyonlinelibrary.com/journal/htj).