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In high-quality two-dimensional electrons confined to GaAs quantum wells,near Landau level filling factors $\nu=$ 1/2 and 1/4, we observe signatures ofthe commensurability of the electron-flux composite fermion cyclotron orbitswith a unidirectional periodic density modulation. Focusing on the data near$\nu=1/2$, we directly and quantitatively probe the shape of the compositefermions' cyclotron orbit, and therefore their Fermi contour, as a function ofmagnetic field ($B_{||}$) applied parallel to the sample plane. The compositefermion Fermi contour becomes severely distorted with increasing $B_{||}$ andappears to be elliptical, in sharp contrast to the electron Fermi contour whichsplits as the system becomes bilayer-like at high $B_{||}$. We present asimple, qualitative model to interpret our findings.

Fermi Contour Anisotropy of GaAs Electron-Flux Composite Fermions in Parallel Magnetic Fields