Stacked nano-thin layers of molybdenum disulfide can both conduct heat and insulate heat at the same time in different directions

https://news.uchicago.edu/story/uchicago-scientists-create-material-can-both-move-and-block-heat

"rotated each successive layer slightly as they stacked them... creating a material with atoms that are aligned in one direction but not in the other... microscopic wall made of this material was extremely good at preventing heat from moving between compartments... could improve the reliability of electronics and other devices"