mˈʌltilˌeɪɚd fˈɪlmz ʌv hˈæfniəm daɪˈɑːksaɪd, sˈɪlɪkə, ænd ˈʌðɚ mətˈɪɹiəlz hɐvbɪn dɪvˈɛləpt fɔːɹ jˈuːs ɪn pˈæsɪv kˈuːlɪŋ ʌv bˈɪldɪŋz.
Multilayered films of hafnium dioxide, silica, and other materials have been developed for use in passive cooling of buildings.