The atomic structure of TiC͑100͒ was determined precisely by low-energy electron diffraction intensity analysis. The surface atomic structure is relaxed; the topmost C atoms are displaced outward and Ti atoms inward with respect to the truncated bulk atomic positions. The results agree qualitatively with earlier theoretical work ͓D. L. Price, J. M. Wills, and B. R. Cooper, Phys. Rev. Lett. 77, 3375 ͑1996͔͒ and quantitatively with the latest theoretical results based on the first-principles molecular dynamics method ͓K. Kobayashi, Jpn.

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