No. Based on the available information, Micro Four Thirds is not an open public standard. The full specification is generally available to member companies rather than to the public, so it is not something you can simply download or buy like an open published spec.

If you need official documentation, the recommended route is to contact the Four Thirds organization directly through the manufacturer inquiry contact listed on their site. In practice, access appears intended for companies developing or selling compliant products, not for general public research.

So if your goal is to study the communication protocol in detail, there likely is no public official document available; you would need to approach the standards body or join through a participating company.