Table 1 MAE Errors in the reflection and transmission without no simulations included in the training data and 5 simulations included in training.

Material	MAE reflection		MAE transmission		Error difference
Material	No simulations	5 Simulations	No simulations	5 Simulations	ΔR	ΔT
Au⁸⁸	0.0637	0.0456	2.63E−05	3.88E−05	− 0.018	1.25E−05
B₄C⁸⁹	0.0394	0.0098	0.0542	0.0091	− 0.030	− 0.045
BaF₂⁹⁰	0.0040	0.0009	0.0907	0.0053	− 0.003	− 0.085
Be⁹¹	0.0086	0.0067	5.01E−06	3.72E−06	− 0.002	− 1.29E−06
C⁹²	0.0972	0.0124	3.11E−04	3.12E−05	− 0.085	− 2.80E−04
Cu⁷⁹	0.0709	0.0880	1.07E−02	1.80E−05	0.017	− 0.011
GaAs⁷⁹	0.0249	0.0106	0.0927	0.0186	− 0.014	− 0.074
Ge⁷⁹	0.0869	0.0216	0.0964	0.0094	− 0.065	− 0.087
In⁹³	0.0312	0.0223	6.95E−06	4.30E−06	− 0.009	− 2.65E−06
InAs⁹⁴	0.0036	0.0030	0.0849	0.0121	− 0.001	− 0.073
InP⁹⁴	0.0098	0.0053	0.0722	0.0126	− 0.005	− 0.060
Li⁹⁵	0.0570	0.0297	8.23E−04	8.21E−04	− 0.027	− 2.04E−06
Mg⁹⁶	0.0434	0.0295	5.84E−06	4.14E−06	− 0.014	− 1.69E−06
Mo⁸²	0.0316	0.0296	7.39E−06	5.04E−06	− 0.002	− 2.35E−06
Nb⁹⁷	0.0156	0.0154	4.55E−06	3.13E−06	0.000	− 1.42E−06
Os⁹⁸	0.0282	0.0291	1.21E−04	1.20E−04	0.001	− 1.70E−06
Pd⁹¹	0.0168	0.0109	1.48E−05	1.02E−05	− 0.006	− 4.56E−06
Pt⁷⁹	0.0096	0.0086	5.49E−06	4.32E−06	− 0.001	− 1.17E−06
Rh⁷⁹	0.0106	0.0125	8.07E−06	6.89E−06	0.002	− 1.18E−06
Si₃N₄⁸⁷	0.0021	0.0021	0.0321	0.0046	0.000	− 0.028
TiO₂	0.0006	0.0016	0.2003	0.0359	0.001	− 0.164
Zn⁹⁰	0.0554	0.0203	1.77E−05	1.34E−05	− 0.035	− 4.31E−06
Zr⁹⁰	0.0141	0.0122	3.21E−05	2.17E−05	− 0.002	− 1.04E−05

The relative error for each material is shown, with nearly all materials showing a significant decrease in error as a result of the small amount of data being included.

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