Comment on “Optical and Resonant X-Ray Diffraction Studies Confirm a $\mathrm{Sm}{C}_{FI2}^{*}-\mathrm{Sm}{C}^{*}$ Liquid Crystal Phase Sequence Reversal”

A Comment on the Letter by S. T. Wang et al., [Phys. Rev. Lett. 96, 097801 (2006)].

Figure 1

Dependence of $\epsilon _{\perp }{}^{\prime }$ on temperature (a) and bias voltage for the phase (?) (b); (open and filled symbols: bias increasing and decreasing, respectively).