European stocks are set to open slightly lower on Tuesday as the rout in commodities ranging from oil to gold shows no signs of abating. Stock-specific movements may be seen as investors await another batch of earnings reports and the all-important U.S. jobs report due on Friday, which could provide some guidance on whether Fed officials plan to raise interest rates when they meet again in September. The dollar held steady against most rivals in Asian deals despite a slew of soft data releases overnight.