NOVELTY - A multi-layer assembly comprises layer A comprising a substrate layer selected from a thermoplastic, metal and glass, layer B comprising a barrier layer selected from titanium and the precious metal group, layer C comprising a reflective metallic layer, layer D comprising an oxidic layer selected from aluminum oxide, titanium dioxide, silicon dioxide, tantalum oxide, zirconium oxide, niobium pentoxide and hafnium oxide, and layer E comprising a plasma polymer layer (anticorrosive layer) and a highly refractive metal oxide layer.    USE - Multi-layer assembly for use as reflector in photovoltaic panels, solar panels, lighting systems and light guide systems, and as a mirror in residential environments and vehicle sector (all claimed) such as aircraft, railway vehicles, buses, utility vehicles and automobiles.    ADVANTAGE - The multi-layer system has high reflectivity over the life cycle, dimensional stability, low cracking tendency and low surface roughness, and can produce multi-layer bodies in a simple and cost-effective manner.    DETAILED DESCRIPTION - A multilayer assembly comprises layer A comprising a substrate layer selected from a thermoplastic, metal and glass, layer B comprising a barrier layer selected from titanium and the precious metal group, such as gold, palladium, platinum, vanadium and tantalum, layer C comprising a reflective metallic layer, layer D comprising an oxidic layer selected from aluminum oxide, titanium dioxide, silicon dioxide, tantalum oxide, zirconium Oxide, niobium pentoxide and hafnium oxide, and layer E comprising a plasma polymer layer (anticorrosive layer) deposited from siloxane precursors selected from hexamethyldisiloxane, octamethylcyclotetrasiloxane, octamethyltrisiloxane, tetraethylorthosilane and tetramethyldisiloxane, decamethylcyclopentasiloxane, hexamethylcyclotrisiloxane, trimethoxymethylsilane and tetramethylcyclotetrasiloxane, and a highly refractive metal oxide layer, where the metal oxides are selected from titanium dioxide, tantalum oxide, zirconium oxide, niobium pentoxide and hafnium oxide, and the layer D alternatively consists of aluminum oxide or silicon dioxide.