Akira Kurosawa on Rashomon

http://www.criterion.com/current/posts/196-akira-kurosawa-on-rashomon

Andrei Tarkovsky on "Solaris"

http://people.ucalgary.ca/~tstronds/nostalghia.com/TheTopics/On_Solaris.html

If you like the film Solaris (1972), then you should also try watching the Solaris (2002) remake. Here's the link: Solaris (2002)