1. Introduction  
2. Data and Methodology  
2.1. Data  
2.2. Source Detection  
2.3. Classification of Detections  
2.4. Characteristics of Cluster Candidates  
3. Results  
3.1. RXGCC Catalog  
3.2. Parameter Distributions  
3.3. Comparison of Radii, Count Rates, and Flux  
4. Discussion  
4.1. Very Extended Candidates  
4.2. False Detections  
4.3. Cross-Match RXGCC with Representative ICM-Detected Cluster Catalogs  
4.4. Known X-ray Sources  
5. Conclusion