The thermo sticker is here:
https://library.ldraw.org/parts/sticker-sheets/13648
Other existing holo-foil stickers are for example:
https://library.ldraw.org/parts/1075 (Simple Glitter effect, but plain silver used instead)
https://library.ldraw.org/parts/43561 (Same Glitter effect, with texmap)
https://library.ldraw.org/parts/1141 (Triangles, colored individually)
https://library.ldraw.org/parts/49954 (Complex hologram image, with texmap)
As you can see, there's no definitive standard at the moment.
https://library.ldraw.org/parts/sticker-sheets/13648
Other existing holo-foil stickers are for example:
https://library.ldraw.org/parts/1075 (Simple Glitter effect, but plain silver used instead)
https://library.ldraw.org/parts/43561 (Same Glitter effect, with texmap)
https://library.ldraw.org/parts/1141 (Triangles, colored individually)
https://library.ldraw.org/parts/49954 (Complex hologram image, with texmap)
As you can see, there's no definitive standard at the moment.