Electrochromic (e.c.) thinÃ¢â‚¬â€layer systems are well suited for the construction of optical devices with controllable, directed, reflectivity. The application of the e.c. effect to reflecting systems is even more efficient than its use in transparent devices since the light travels twice through the absorbing layer of the electrochromic material, which, in this case, is positioned between light source and reflector as well as reflector and receiver or observer. This application, in addition, offers a greater choice of materials for constructing the devices in that some of the layers of the e.c. system can be arranged behind the reflector or reflecting electrode and can thus be lightÃ¢â‚¬â€ absorbing, reflecting, or can have a variable transmittance, e.g. electrochromic materials can be used as storing layers. Several papers on the modes of construction of reflecting e.c. systems have appeared, 1-4 and the worldÃ¢â‚¬â€wide state of affairs was recently reported.