  This study deals with the investigation of MHD flow of Williamson fluid over
an infinite rotating disk with the effects of Soret, Dufour, and anisotropic
slip. The anisotropic slip and the Soret and Dufour effects are the primary
features of this study, which greatly influence the flow, heat and mass
transport properties. In simultaneous appearance of heat and mass transfer in a
moving fluid, the mass flux generated by temperature gradients is known as the
thermal-diffusion or Soret effect and the energy flux created by a composition
gradient is called the diffusion-thermo or Dufour effect, however, difference
in slip lengths in streamwise and spanwise directions is named as anisotropic
slip. The system of nonlinear partial differential equations (PDEs), which
governs the flow, heat and mass transfer characteristics, is transformed into
ordinary differential equations (ODEs) with the help of von K\'arm\'an
similarity transformation. A numerical solution of the complicated ODEs is
carried out by a MATLAB routine bvp4c. The obtained results of velocity,
temperature, concentration, and some physical quantities are displayed through
graphs and tables, and their physical discussion is presented.
