The deformation of metallic flat plates into cylindrical segments, or the shielding of flat plates by such segments, reduces the large specular echo but may not necessarily reduce the mean cross section by more than 1 dB or so. A useful reduction in the mean return can be achieved only if the angle subtended by the cylindrical segment is significantly greater than the angular base interval over which the mean is taken. For all save very small intervals, the radar cross section reduction is independent of frequency.
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Eugene F. Knott (1976) studied this question.