Exhibit II

to

Schedule 13G

Joint Filing Agreement

The undersigned persons agree and consent to the joint filing on their behalf of this Schedule 13G dated January 9, 2015 in connection with their beneficial ownership of Mattson Technology, Inc. Each of Columbia Seligman Communications & Information Fund and Columbia Management Investment Advisers, LLC authorizes Ameriprise Financial, Inc. to execute the Schedule 13G to which this Exhibit is attached and make any necessary amendments thereto.

Ameriprise Financial, Inc.

By:	/s/ Martha Skinner
	Martha Skinner
	Director – Financial Reporting – Accounting and Administration Services
Columbia Management Investment Advisers, LLC
By:	/s/ Amy Johnson
	Amy Johnson
	Title: COO and Managing Director
Columbia Seligman Communications & Information Fund
By:	/s/ Paul Goucher
	Paul Goucher
	Senior Vice President, Chief Legal Officer and Assistant Secretary