“…In most macroscopic applications, TMAC is generally assumed to be unity, expressing diffusive reflection on the surfaces. While in many higher Kn experiments [9][10][11][12][13][14][15][16] and molecular dynamics (MD) simulations [17][18][19][20][21][22][23][24][25], the TMAC was reported to be always less than unity. For a variety of gases (mostly noble gases) on metals, semiconductors, or even glass surfaces, the TMAC may be impacted by many factors, such as gas and wall materials [9][10][11][12][13][14][15][16][20][21][22][23][24], incident gas angle and energy [9,11,[17][18][19]21], surface roughness [23], wall temperature [9,11,[17][18][19][21][22][23] and adsorbed layers or gas molecules adsorption [13,…”