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For a layer circuit, prepare a set of combinations to efficiently sample

parallel two-qubit XEB circuits.

n_library_circuits The number of circuits in your library. Likely the value passed to generate_library_of_2q_circuits.
n_combinations The number of combinations (with replacement) to generate using the library circuits. Since this function returns a CircuitLibraryCombination, the combinations will be represented by indexes between 0 and n_library_circuits-1 instead of the circuits themselves. The more combinations, the more precise of an estimate for XEB fidelity estimation, but a corresponding increase in the number of circuits you must sample.
layer_circuit A calibration-style circuit where each Moment represents a layer. Two qubit operations indicate the pair should be activated. This circuit should only contain Moments which only contain two-qubit operations.
random_state A random-state-like object to seed the random combination generation.

A list of CircuitLibraryCombination, each corresponding to a moment in layer_circuit. Each object has a combinations matrix of circuit indices of shape (n_combinations, len(pairs)) where len(pairs) may be different for each entry (i.e. for moment). This returned list can be provided to sample_2q_xeb_circuits to efficiently sample parallel XEB circuits.