What is meant by structural capital?

Capital structure is the composition of long-term liabilities, specific short-term liabilities like bank notes, common equity, and preferred equity which make up the funds with which a business firm finances its operations and its growth. The capital structure of a business firm is essentially the right side of its balance sheet.

A structural capital is any organizations primary component that allows the human capital to perform its job. For example any proprietary software or data bank that the company may have.