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Dependence of the transmission on the electron injection angle for (a) single layer, (b) bilayer, and (c) trilayer ABC stacked graphene. The thick black curves are the transmission across a PN-junction with . The thin curves are transmission probabilities across a 100 nm wide rectangular PNP-barrier for electron energy (a) and ((b) and (c)) . The barrier heights are: (a) 100 and ((b) and (c)) 65 meV (solid red curves); and (a) 120 and ((b) and (c)) 80 meV (dotted blue curves). These parameters are the same as those given in Ref. 1.
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