The simulation temperature was 300 K, using the Nose-Hoover thermostat. All of the monolayers in Table are dynamically stable in the unstrained and ±5% strained states except for Ti 3 C 2 O 2 , which is dynamically stable in the unstrained and +5% strained states, but is dynamically unstable in the -5% strained case, as shown in Table in the Supplementary Information. We have provided results for bilayers with dynamically unstable monolayers in Table in the Supplementary Information.