Deciding upon the most appropriate structure when a firm has international operations depends on the:

"The extent of international expansion " is the correct approach.

Explanation:

The expected expansion of something like a business organization in many areas around the globe across communities.Choosing the right the much more suitable structure whenever a company has overseas operations consists of the following three major contributing factors: severity of overseas operations, category of the strategic plan, as well as the extensiveness of differentiated products.

An informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.