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. • The comment concerns a paper published in Journal of Molecular Liquids. • The first Rivlin-Ericken parameter is dimensional, not dimensionless as the authors claim. • The similarity method used for the non-similar problem is not accurate. [ABSTRACT FROM AUTHOR]