As the molecular fragment was moved further from the head group, the number of ad- sorbed BC-modified ligands increased almost linearly, while BR-and NR-modified ligands exhibited an initial increase followed by a plateau (Figure ). In contrast, DB-modified ligands showed a unique trend, with an initial decrease in n max followed by an increase (Fig- ). The adsorption behavior is influenced by both head group-core interactions and ligand tail packing. For BC-modified ligands, the steric hindrance resulting from the alkyl side chain primarily affects ligand-ligand interactions, with its influence diminishing as the fragment moves from p-to d-position. BR and NR introduce both steric hindrance and π-π stacking interactions between aromatic rings, which play a crucial role in ligand-ligand interactions. Hence, except for steric effects near the head group, π-π interactions dominate in other positions, reducing the positional effects as the fragments shift away from the head group. Notably, some NR-modified ligands (mNR, mdNR and dNR) show higher adsorption than OD (Figure ). For DB-modification, which introduces chain flexibility rather than steric hindrance, ligand adsorption was most affected when the fragment was located in the middle of the chain.