(color online) Charge transfer values of different atoms in different 211 MAX phases, illustrating the discussion about the resistance to amorphization. The red column denotes charge transfer of the M atom in M₂AlC, the green column refers to charge transfer of the A atom in Cr₂AC, while the blue column represents charge transfer of the X atom in Ti₂Al X. A positive value shows that they lose electrons, whereas the negative value denotes that they gain electrons.