THIS PROPOSAL IS THE LEAD PROPOSAL FOR THE SUBORBITAL INVESTIGATION TITLED ULTRA-HEAVY COSMIC RAY OBSERVATIONS WITH SUPERTIGER-2: FLIGHT RECOVERY AND DATA ANALYSIS. WE SUBMIT HERE A PROPOSAL FOR A SUPERTIGER-2 (HEREAFTER ST-2) BALLOON FLIGHT OVER ANTARCTICA IN DECEMBER OF 2019 WITH THE PRIMARY OBJECTIVE OF MEASURING THE ABUNDANCES OF INDIVIDUAL ELEMENTS