Comment on the paper 'Impact of variable thermal conductivity in doubly stratified chemically reactive flow subject to non-Fourier heat flux theory, T. Hayat, M. Zubair, M. Waqas, A. Alsaedi, M. Ayub, Journal of Molecular Liquids 234 (2017) 444–451'

In the above paper the first Rivlin-Ericken parameter is dimensional, not dimensionless as the authors claim. In addition, although the problem is non-similar, the authors used the similarity method of solution which is not accurate.