TECHNOLOGY FOCUS - ELECTRICAL POWER AND ENERGY - Preferred Method: The treated inner surface of the layer (L1) is contacted with an electroless metallization catalyst to provide a catalytic surface and the catalytic surface is then contacted with an electroless metallization plating bath comprising the metal compound to provide the layer (L1) having the inner surface coated with the layer (L2). The process further comprises: (iv) applying by electro-deposition a metal layer (L3) onto the opposite side of the layer (L2) as provided in step (iii). The layer (L3) is made of a composition comprising at least one metal compound, where the composition (C3) is equal to or different from composition (C2); and (v) optionally, applying one or more further layers onto the opposite side of the layer (L3). The nitrogen-based functionalities are grafted on the treated inner surface of the layer (L1). Preferred Components: The layer (L1) has a transmittance of at least 70%, preferably at least 85% of the incident electromagnetic radiation. The electroless metallization plating bath comprises at least one compound (M) comprising one or more metal salts, at least one reducing agent, at least one liquid medium and, optionally, one or more additives. The layer (L2) has a thickness comprised of 0.05-5 ~mm, preferably 0.8-1.5 ~mm. The layer (L3), if any, has a thickness of 0.1-30 ~mm, preferably 1-15 ~mm. The solar concentrator comprises at least one multilayer mirror assembly and a heat transfer fluid or a photovoltaic cell.    TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Components: The etching gas is free from oxygen and the glow discharge is a plasma discharge. The etching gas is nitrogen, ammonia, carbon dioxide and/or hydrogen.    TECHNOLOGY FOCUS - POLYMERS - Preferred Components: The polymer (F) is: (1) polymers (F-1) comprising recurring units derived from at least one fluorinated monomer comprising tetrafluoroethylene (TFE) or chlorotrifluoroethylene (CTFE), and from at least one hydrogenated monomer comprising ethylene, propylene or isobutylene, optionally containing one or more additional comonomers at 0.01-30 mole%, based on the total amount of TFE and/or CTFE and the hydrogenated monomer(s); (2) polymers (F-2) comprising recurring units derived from vinylidene fluoride (VDF), and, optionally from one or more fluorinated monomers different from VDF; (3) polymers (F-3) comprising recurring units derived from TFE and at least one fluorinated monomer different from TFE, comprising perfluoroalkyl vinyl ethers of formula (CF2=CFORf1), perfluoro-oxyalkyl vinyl ethers of formula (CF2=CFOX0), 3-8C perfluoroolefins, such as hexafluoropropene or perfluorodioxole compounds of formula (A); or (4) polymers (F-4) comprising recurring units derived from at least one cyclopolymerizable monomer of formula (C(R7)(R8)=C(R9)(R10)(R11)(CR12R13)a(O)bCR14=CR15R16). The polymer (F) is a polymer (F-1) comprising (a) 30-48 mole%, preferably 35-45 mole% of ethylene (E), (b) 52-70 mole%, preferably 55-65 mole% of chlorotrifluoroethylene (CTFE) and/or tetrafluoroethylene (TFE) and (c) up to 5 mole%, preferably up to 2.5 mole% of one or more fluorinated and/or hydrogenated comonomer(s) based on the total amount of monomers (a) and (b).Rf1 = 1-6C perfluoroalkyl group;X0 = 1-12C perfluorooxyalkyl group comprising one or more ether groups, such as perfluoro-2-propoxy-propyl group;R1-R4 = -F, 1-6C fluoroalkyl group, optionally comprising one or more oxygen atoms, or 1-6C fluoroalkoxy group, optionally comprising one or more oxygen atoms;R7-R16 = -F or 1-3C fluoroalkyl group; anda, b = 0 or 1, with the proviso that b is 0 when a is 1.