The term "inner layers" can be synonymous with other phrases such as "core components", "interior structures" and "central elements". These phrases refer to the foundational aspects of an object or system that are usually hidden from view. Other possible synonymous phrases include "deep layers", "inner workings" and "hidden layers". These phrases are often used in technical contexts such as electronics, where understanding the inner layers of a circuit board or chip is crucial for repair, maintenance and improvement. In general, these phrases emphasize the importance and complexity of the hidden aspects of an object or system that are critical to its overall functioning.