The text shows that a body with uniform polarization P and uniform velocity generates a magnetization

The text shows that a body with uniform polarization P and uniform velocity ν generates a magnetization M = P × ν. Confirm this by comparing the convection surface current density to the presumed magnetization surface current density when a slab of matter with polarization P = P ˆz occupies the volume between the planes z = and z = d and the slab moves with velocity ν = νx̂.