A plastic film having a thickness of 0.05 mm to 0.25 mm, comprising a thermoplastic composition that comprises: a first polycarbonate derived from a dihydroxy compound and a carbonate source, comprising repeat units according to formula wherein at least 60 percent of the total number of R 1 groups contain aromatic moieties and the balance thereof are aliphatic, alicyclic, or aromatic; wherein the first polycarbonate further comprises branching groups derived from a first branching agent and end-capping groups derived from an end-capping agent; and wherein the first polycarbonate has a peak melt viscosity of at least 700 pascal-seconds (Pa·sec) (7,000) poise when measured using a parallel plate melt rheology test at a heating rate of 10°C/min at a temperature of between 350°C to 450°C; and a second polycarbonate comprising repeat units according to formula wherein at least 60 percent of the total number of R 1 groups contain aromatic moieties and the balance thereof are aliphatic, alicyclic, or aromatic, and wherein the second polycarbonate further comprises a second branching agent; and a perfluoroalkyl sulfonate salt; wherein the end-capping groups of the first polycarbonate comprise cyanophenyl carbonate groups, or wherein the first polycarbonate is configured so as to have molecular weight, branching agent content, and end-capping agent such that a calculated peak melt viscosity equals at least 700 pascal-seconds (Pa·sec) (7000 poise) according to the equation: -57135.91 + 36961.39 * BL + 14001.13 * MW 1/3 -46944.24 * pKa - 322.51 * BL* MW 1/3 - 2669.19 * BL* pKa + 215.83 * MW 1/3 * pKa + 1125.63 * BL 2 - 200.11 * MW 2/3 + 2231.15 * pKa 2, wherein "MW" is the weight-averaged molecular weight as determined by gel permeation chromatography using polycarbonate standards, "BL" (branching level) is defined as the ratio of number of moles of first branching groups divided by the number of moles of R 1 groups in the first polycarbonate, and "pKa" is the pKa of the end-capping agent, or wherein the end-capping groups of the first polycarbonate comprise cyanophenyl carbonate groups and the first polycarbonate is configured so as to have molecular weight, branching agent content, and end-capping agent such that a calculated peak melt viscosity equals at least 700 pascal-seconds (Pa·sec) (7000 poise) according to the equation: -57135.91 + 36961.39 * BL + 14001.13 * MW 1/3 - 46944.24 * pKa - 322.51 * BL* MW 1/3 - 2669.19 * BL* pKa + 215.83 * MW 1/3 * pKa + 1125.63 * BL 2 -200.11 * MW 2/3 + 2231.15 * pKa 2. a first polycarbonate derived from a dihydroxy compound and a carbonate source, comprising repeat units according to formula wherein at least 60 percent of the total number of R 1 groups contain aromatic moieties and the balance thereof are aliphatic, alicyclic, or aromatic; wherein the first polycarbonate further comprises branching groups derived from a first branching agent and end-capping groups derived from an end-capping agent; and wherein the first polycarbonate has a peak melt viscosity of at least 700 pascal-seconds (Pa·sec) (7,000) poise when measured using a parallel plate melt rheology test at a heating rate of 10°C/min at a temperature of between 350°C to 450°C; and a second polycarbonate comprising repeat units according to formula wherein at least 60 percent of the total number of R 1 groups contain aromatic moieties and the balance thereof are aliphatic, alicyclic, or aromatic, and wherein the second polycarbonate further comprises a second branching agent; and a perfluoroalkyl sulfonate salt; wherein the end-capping groups of the first polycarbonate comprise cyanophenyl carbonate groups, or wherein the first polycarbonate is configured so as to have molecular weight, branching agent content, and end-capping agent such that a calculated peak melt viscosity equals at least 700 pascal-seconds (Pa·sec) (7000 poise) according to the equation: -57135.91 + 36961.39 * BL + 14001.13 * MW 1/3 -46944.24 * pKa - 322.51 * BL* MW 1/3 - 2669.19 * BL* pKa + 215.83 * MW 1/3 * pKa + 1125.63 * BL 2 - 200.11 * MW 2/3 + 2231.15 * pKa 2, wherein "MW" is the weight-averaged molecular weight as determined by gel permeation chromatography using polycarbonate standards, "BL" (branching level) is defined as the ratio of number of moles of first branching groups divided by the number of moles of R 1 groups in the first polycarbonate, and "pKa" is the pKa of the end-capping agent, or wherein the end-capping groups of the first polycarbonate comprise cyanophenyl carbonate groups and the first polycarbonate is configured so as to have molecular weight, branching agent content, and end-capping agent such that a calculated peak melt viscosity equals at least 700 pascal-seconds (Pa·sec) (7000 poise) according to the equation: -57135.91 + 36961.39 * BL + 14001.13 * MW 1/3 - 46944.24 * pKa - 322.51 * BL* MW 1/3 - 2669.19 * BL* pKa + 215.83 * MW 1/3 * pKa + 1125.63 * BL 2 -200.11 * MW 2/3 + 2231.15 * pKa 2.