The Passenger (Michelangelo Antonioni, Italy/Spain/France, 1975)

passenger
A classic of a difficult and alienating kind, but one that really does shimmer in the mind like a remembered dream.
— Peter Bradshaw, The Guardian

Following Plein Soleil another film that centres on an identity theft. 

A jaded and world-weary war correspondent (Jack Nicholson) researching a documentary in the Sahara Desert meets a gunrunner who dies suddenly. When the journalist notices that they have a similar appearance, he assumes the recently deceased's identity and accepts the consequences that it brings.