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| |  | ||   / _ \\  |  __ \\   \ \\/ //  | \| || 
| |/\| ||  / //\ \\ | |  \ ||   \ ` //   |  ' || 
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Text this: A2Bn-1PbnI3n+1 (A = BA, PEA; B = MA; n = 1, 2): engineering quantum-well crystals for high mass density and fast scintillators