Vanishing shear viscosity and boundary layers for plane magnetohydrodynamics flows

In this paper, we consider an initial-boundary problem for plane magnetohydrodynamics flows under the general condition on the heat conductivity $\kappa$ that may depend on both the density $\rho$ and the temperature $\theta$ and satisfies $$ \kappa(\rho,\theta)\geq\kappa_1(1+\theta^{q}) \quad \hbox{\rm with constants}~ \kappa_1>0 ~\hbox{\rm and}~ q>0. $$ We prove the global existence of strong solutions for large initial data and justify the passage to the limit as the shear viscosity $\mu$ goes to zero. Furthermore, the value $\mu^\alpha$ with any $0<\alpha<1/2$ is established for the boundary layer thickness.