Comment on "intense nonlinear magnetic dipole radiation at optical frequencies: molecular scattering in a dielectric liquid".

In the theoretical section of their Letter, the authors claim the result that ‘‘the magnetic current density is minus one half the total current density’’ [1]. In this Comment, I argue that their argument is flawed and their conclusion is invalid. The authors consider an incident plane wave of angular frequency ! that propagates in the z-direction with its electric field linearly polarized along x̂ and its magnetic field oriented along ŷ. They then assert that, in conductors and insulators alike,