With so much interest in value investing, and market conditions that lean in favor of value (right now anyway), Morgan Stanley (NYSE:MS) regularly uses two screens specifically aimed at finding quality stocks that may be underpriced. Joel Greenblatt screen The Joel Greenblatt screen, inspired by the renowned value investor, focuses on high-quality non-financial companies, and tries to determine which ones are currently cheap by looking for low EV/EBITDA ratios and a high ROCE. The Greenblatt screen found four companies overweight. British energy firm Afren Plc (LON:AFR) (OTCMKTS:AFRNY), with a market cap of $2.33 billion and trading around £1.35, has an…