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Using field theoretic renormalization, an MBE-type growth process with anobliquely incident influx of atoms is examined. The projection of the beam onthe substrate plane selects a "parallel" direction, with rotational invariancerestricted to the transverse directions. Depending on the behavior of aneffective anisotropic surface tension, a line of second order transitions isidentified, as well as a line of potentially first order transitions, joined bya multicritical point. Near the second order transitions and the multicriticalpoint, the surface roughness is strongly anisotropic. Four different roughnessexponents are introduced and computed, describing the surface in differentdirections, in real or momentum space. The results presented challenge anearlier study of the multicritical point.Comment: 11 pages, 2 figures, REVTeX

Strongly anisotropic roughness in surfaces driven by an oblique particle flux