Top marketing executives at both Macy’s and Kohl’s announced their resignations Tuesday. After more than three decades at Macy’s, Chief Marketing Officer Martine Reardon is leaving the company, the retailer said. Ms. Reardon was promoted to the CMO post four years ago. Her last day with the 870-store chain will be May 13. Separately, Will Setliff, exec VP-marketing at Menomonee, Wisc.-based Kohl’s is leaving the company this week.