Novel polyester composition comprising a polyester, wherein said polyester comprises structural units derived from substituted or unsubstituted diacid or diester, a substituted or unsubstituted diol; a phosphorus containing compound and at least one selected from a stabilizer and an organic compound comprising at least one functional group is been disclosed. An attenuating spacer between the first cladding portion and the second cladding portion is formed from a smart material. The photovoltaic conversion layer has an upper side attached to a lower side of the first transparent substrate, and the touch electrode layer is formed on an upper side of the second transparent substrate and attached to a lower side of the photovoltaic conversion layer. Furthermore, baseline andor sensitivity measurements may be used to trigger events such as digital filtering of data or suspending display of data. In one embodiment, the apparatus includes a diffuser interposable in an optical path of a PVD system and a diffuser actuator having a single drive axis configured to cause the diffuser to travel in a lissajous curve at least partially transverse to the optical path.