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In Chapter [*] I showed that in 2D, specularly-reflected multiples, when migrated with the velocity of the primaries, map to subsurface offsets with the opposite sign to that of their surface offset in Subsurface-Offset-Domain Common-Image Gathers (SODCIGs). In Angle-Domain Common-Image Gathers (ADCIGs) they map with curvature towards increasing depths. In this chapter I extend these ideas to 3D and show, with a 3D synthetic prestack dataset, that specularly-reflected multiples in 3D have a similar behavior with an interesting addition: in 3D ADCIGs, the primaries and multiples exhibit different azimuth dependence as a function of the dip of the reflecting interface generating the multiple. This attribute is used to discriminate between primaries and multiples in 3D ADCIGs and therefore help in the attenuation of the multiples.