for several different values of $W$, when $x_m=x_{m,b}$ and $\theta_i= 62.33^\circ$. The GH shift is negative in this case. (c) Comparison of the magnetic field profiles associated with the reflected beams corresponding to the backward ($x_m=0.08581$) and forward ($x_m=0.08717$) GH shifts, when $W = 320$ $\mu$m and $\theta_i= 62.33^\circ$.](fig7){width="8.5cm"}

In figures 7(a) and 7(b), we plot the magnetic field intensity distribution associated with the reflected beam at the reflectance dip ($\theta_i=62.33^\circ$) for several different values of $W$, when $x_m=x_{m,f}$ and $x_m=x_{m,b}$ respectively. In all cases, we observe clearly that the reflected beam is split into two parts. In the case of the plane-wave incidence, the reflectance is very low. This should apply to other Fourier components as well, so the intensity of the reflected beam is substantially weaker than that of the incident beam.

In figure 7(c), we compare the magnetic field profiles associated with the reflected beams corresponding to the backward ($x_m=x_{m,b}$) and forward ($x_m=x_{m,f}$) GH shifts, when $W = 320$ $\mu$m and $\theta_i= 62.33^\circ$. We observe that the left peak is larger than the right peak in the case of the backward GH shift, while it is vice versa in the case of the positive GH shift. The 