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The roughness exponent of surfaces obtained by dispersing silica spheres intoa quasi-two-dimensional cell is examined. The cell consists of two glass platesseparated by a gap, which is comparable in size to the diameter of the beads.Previous work has shown that the quasi-one-dimensional surfaces formed have twodistinct roughness exponents in two well-defined length scales, which have acrossover length about 1cm. We have studied the effect of changing the gapbetween the plates to a limit of about twice the diameter of the beads.Comment: 4 pages, 4 figures, submitted to IJMP

THE EFFECT OF THE THIRD DIMENSION ON ROUGH SURFACES FORMED BY SEDIMENTING PARTICLES IN QUASI-TWO-DIMENSIONS