Algebraic Decay of Successive Harmonics in a Model Two-Dimensional System

We report a high-resolution synchrotron x-ray scattering study of the weakly incommensurate stripe-domain phase of stage-4 bromine-intercalated graphite. We demonstrate power-law behavior at five harmonics ($\overrightarrow{\mathrm{G}}$) of the mass density wave, and confirm the scaling of the structure factor with $G^2$. Our results are consistent with recent theories of the two-dimensional uniaxial commensurate-incommensurate transition.