Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids; ; characterised by an apertured layer
characterised by a layer comprising a deformed thin sheet; , i.e. the layer having its entire thickness deformed out of the plane; , e.g. corrugated, crumpled
