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The local density of states (LDOS) of the adsorbate induced two-dimensionalelectron system (2DES) on n-InAs(110) is studied by low-temperature scanningtunneling spectroscopy. The LDOS exhibits irregular structures with fluctuationlengths decreasing with increasing energy. Fourier transformation reveals thatthe k-values of the unperturbed 2DES dominate the LDOS, but additional lowerk-values contribute significantly. To clarify the origin of the additionalk-space intensity, we measure the potential landscape of the same 2DES areawith the help of the tip induced quantum dot. This allows to calculate theexpected LDOS from the single particle Schroedinger equation and to directlycompare it with the measured one. Reasonable correspondance between calculatedand measured LDOS is found.Comment: 7 pages, 4 figures, submitted to PR

Direct Comparison between Potential Landscape and Local Density of States in a Disordered Two-Dimensional Electron System