Strip conductor arrangement and method for producing a strip conductor arrangement

An interconnect arrangement comprises a substrate made from a first insulating material with a substrate surface, at least two interconnects which are arranged next to one another in the substrate, a buffer layer made from a second insulating material above the substrate and comprising a buffer-layer surface, which is parallel to the substrate surface, at least one cavity, which is arranged between the interconnects and, with respect to the buffer-layer surface, extends deeper into the substrate than the interconnects, and a covering layer made from a third insulating material, which is arranged above the buffer layer and completely closes off the cavity with respect to the buffer-layer surface.