1. INTRODUCTION  
2. SAMPLE AND DATA  
2.1. The KCS Sample  
2.2. Summary of the HST data sets  
2.3. HST data reduction  
2.4. Construction of photometric catalogues  
3. THE RED SEQUENCE SAMPLE  
4. ANALYSIS  
4.1. Light-weighted structural parameters  
4.2. Stellar mass-to-light ratio – color relation and integrated stellar masses  
4.3. Resolved stellar mass surface density maps and mass-weighted structural parameters  
5. RESULTS  
5.1. Stellar mass – light-weighted size relations  
5.2. Stellar mass – mass-weighted size relations  
6. SUMMARY AND CONCLUSIONS