29,32,34, 35, 36 Rienks et al.30 reported that Mn doping in Bi2Te3 films results in the spontaneous formation of stoichiometric MBT septuple layers (SLs) rather than the chemical substitution of Bi by Mn.37,38 These MBT SLs interpolate between Bi2Te3 quintuple layers to form natural Bi...