The invention relates to a method for preparing a thin film of at least one compound of formula AM4X8, where: A is Ga or Ge; M is V, Nb, Ta or Mo; and X is S or Se. A plastic tray container which is stable when disposed horizontally or vertically provides better processing and an improved package for both retailers and consumers. Thus suppressing the color mixing that could occur without the incorporation of reflective islands. The cross section of the elongated member in an axial direction can be in the shape of a circle, ellipse, triangle or any shaped polygon. A user can thereafter selectively decompress desired portions of the document, without decompressing the entire document. The amount of enhancement may be improved by configuring the diameter and refractive index of the microspheres in conjunction with the dispersion and the wavelength of the radiation to increase the intensity of the beam of radiation in the photonic nanojet.