Finding a company's organizational chart can be a challenge. A company's annual report may include the organizational structure, but some companies consider it proprietary information.
Try searching the article databases ABI/INFORM and Business Source Complete using company name AND the terms: organizational structure. Ex: starbucks and organizational structure.
Limiting your search to PowerPoint or PDF files can sometimes yield org chart information. To do this, type [company name] organizational chart filetype:ppt into the search box or [company name] organizational chart filetype:pdf