The effect of material vs angle on the radar cross section (RCS) of an object depends on the specific scenario, as both factors can be significant in different ways. The material properties of an object can greatly impact the RCS since different materials have different electrical properties that affect how electromagnetic waves interact with them. For example, a metallic object may reflect a significant amount of energy, while a non-metallic object may absorb or scatter more of the energy. However, the angle of incidence is also important, as the RCS can vary significantly depending on the angle at which the radar waves hit the object. At some angles, the radar energy may bounce off the object with minimal scattering, while at other angles it may scatter in many directions, leading to a much larger RCS. So in practice, both the material and the angle of incidence need to be considered when calculating or measuring RCS.
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